import zipfile
from pathlib import Path


def safe_extractall(zf: zipfile.ZipFile, dest: Path) -> None:
    dest_resolved = Path(dest).resolve()
    for member in zf.namelist():
        if member.startswith(("/", "\\")):
            raise ValueError("Unsafe absolute zip member path: %r" % (member,))
        parts = Path(member).parts
        if ".." in parts:
            raise ValueError(
                "Unsafe parent-traversal zip member path: %r" % (member,)
            )
        target = (dest_resolved / member).resolve()
        if target != dest_resolved and dest_resolved not in target.parents:
            raise ValueError("Zip member escapes destination: %r" % (member,))
    zf.extractall(dest_resolved)